Cut the last X bytes of a file (Windows Win32 API), c++

Very small assignment. Take a file. Truncate it's last 20 bytes without reading and writing to a temp file, but using using a single CreateFile, seeking to the position we wish to cut from and placing an EOF marker using SetEndOfFile or similar method for Windows.

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Hello
My name is Ahmed, i'm a top rated freelancer.
i worked over 250 projects and over 600 hours doing C++ and Java projects.
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Dear Client,
I am a professional Software Engineer with a [url removed, login to view] degree in Computer Science. I want to do your job because of the C++ Problem.
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Hello, I am working with WinAPI for a time, and know how to solve your task. Waiting for accept.
I will use this sequence:
1. Open the file using OpenFile
2. Move to the (GetFileSize - 20) bytes.
3. Set EOF here usMehr

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